This AR15 upper receiver assembly comes ready to attach to any Mil-Spec lower receiver. It is built around a 10.5 inch, 300 Blackout barrel, that is optimized for stability with a 1:8 twist rate. The upper receiver is a forged M4 flat top upper, allowing you to easily attach rifle scopes and red dot sights to the picatinny rail. Designed to handle the hardest use and abuse of tactical and competitive shooting, this upper assembly is outfitted with a quad rail.
Outfitted with a 9″ IRS Rail that features anti-turn millings that prevent turning even at the hardest use. The rail also features four full-length picatinny attachment points and a top rail that sits flush with the upper receiver, allowing you to have more space for optics and back up iron sights. This upper assembly comes with a standard A2 flash hider that effectively suppresses muzzle flash and protects the 5/8×24 barrel threads if you are planning on adding a muzzle break in the future.
- 7075-T6 Aluminum
- Mil-Spec Anodized Receiver
- Pistol Length Gas Tube Assembly
- 10.5″ 300 AAC Blackout Barrel
- 4150 Chrome Moly Steel Nitride Coated Barrel
- Standard A2 Flash Hider
- Twist Rate: 1:8
- 9″ Hera Arms Unmarked IRS Handguard/Rail
- *Does Not Include Bolt Carrier Group & Charging Handle*
Please Note: An “AR-15 Pistol” upper assembly has a barrel less than 16” in length. Pistol uppers are only for use on AR-15 pistol lowers and legal Short-Barreled Rifles. Other configurations may violate Federal law. Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.
Product Details: AR-15 Upper Assembly – 10.5″ / 300 AAC / 1:8 / 9″ Hera Arms IRS Unmarked AR-15 Handguard / Rail
➲ Upper Receiver
The foundation of all good AR's is built upon a dependable upper receiver. CBC upper receivers offer best-in-class quality while providing you years of dependable service. Boasting a MIL-SPEC type III hard coat anodized finish and machined from 7075-T6 forged aluminum, this M4 flat-top receiver delivers a lifetime of superior function. You want your AR built upon a solid platform - this receiver gives you the confidence that your AR-15 will function when it counts most.
➲ Pistol Length Gas Tube
An essential component to your AR15 is the gas tube, which keeps your build up and running. This gas tube is constructed from corrosion resistant stainless steel ensuring a lifetime of service.
➲ .750 Low Profile Gas Block
The gas block is a critical link in the chain that is too often overlooked. This component ensures that your AR runs reliably. Made from high-quality steel with a smooth nitride finish, this gas block is efficiently designed to stay put with the percussion of gunfire. With its low profile this gas block allows it to fit under the most ergonomically designed handguards and rails on the market.
➲ IRS Handguard
Your AR-15 handguard has huge implications in terms of how much you enjoy your shooting experience. This IRS handguard offers more than just the accuracy enhancements that come with a free-floating rail. It features a modern design and is machined from high-quality aluminum giving it the capability to handle the hardest use and abuse of tactical and competitive shooting. With four full-length picatinny top rail that sits flush with M4 flat top receivers allowing you to have more space for optics and back up iron sights. This AR-15 handguard has a hard coat anodized black finish and features anti-turn millings that prevent turning even at the hardest use.
➲ A2 Flash Hider
The muzzle device is designed to perform a specific task, like suppress flash intensity or reduce felt recoil. This A2 Flash Hider is machined from quality steel and finished with an exceptionally corrosion resistant salt bath nitride for a lifetime of service. It provides effective flash suppression that preserves the shooter’s night vision by disrupting the muzzle flash when firing in low lighting conditions. While its closed bottom with top and side ports offers reduced dust signature when shooting from the prone position while additionally acting as a compensator.
➲ 300 Blackout Barrel
The barrel is one of the few components that directly affect the accuracy and weight of your build. This barrel has a nitride finish for increased strength and durability. This provides not only an impressive barrel life but ensures excellent accuracy. This barrel is optimized for stability with a 1:8 twist rate, making it the perfect match for the 300 Blackout caliber.
CBC provides a wide selections of AR-15 upper assemblies in a variety of styles and lengths - all partial AR-15 uppers are assembled with everything less the charging handle and bolt carrier group. Our partial upper assemblies offer quality and performance that will satisfy the most demanding shooter. Better yet, all CBC AR-15 uppers are custom built-to-order enabling us to provide you with the best prices you will find anywhere. The quality of our AR-15 uppers are backed by our Lifetime Warranty - if any CBC upper assembly becomes defective, we will repair or replace it at no charge. Get your AR-15 upper assembly at CBC today and save with free shipping!